Dining chair with square back



FIG. 1 is a perspective view of the design taken from above and showing the right side thereof;

FIG. 2 is a front view of the design;

FIG. 3 is a back view of the design;

FIG. 4 is a right side view of the design, the left side view being the mirror image of the right side; and,

FIG. 5 is a top view of the design. 

The ornamental design for a dining chair with square back, as shown and described. 